W. P. Piekielek

Soil and Tissue Nitrate Tests Compared for Predicting Soil Nitrogen Availability to Corn

R. H. Fox, G. W. Roth, K. Iversen et al. · Agronomy Journal · 1989 · 215 citations

Agriculture, Crop Sciences, Soil Sciences +17

Use of a Chlorophyll Meter at the Early Dent Stage of Corn to Evaluate Nitrogen Sufficiency

W. P. Piekielek, R. H. Fox, John D. Toth et al. · Agronomy Journal · 1995 · 188 citations

Agriculture, Agronomy, Crop Sciences +14

Using a chlorophyll meter to predict nitrogen fertilizer needs of winter wheat

R. H. Fox, W. P. Piekielek, K. M. Macneal · Communications in Soil Science and Plant Analysis · 1994 · 122 citations

Agriculture, Agronomy, Crop Sciences +17

Nitrogen Fertilizer Source, and Method and Time of Application Effects on No‐till Corn Yields and Nitrogen Uptakes¹

R. H. Fox, Jürgen Kern, W. P. Piekielek · Agronomy Journal · 1986 · 117 citations

Agriculture, Crop Sciences, Soil Sciences +17

Fertilizer N Equivalence of Alfalfa, Birdsfoot Trefoil, and Red Clover for Succeeding Corn Crops

R. H. Fox, W. P. Piekielek · jpa · 1988 · 94 citations

Agriculture, Agronomy, Crop Sciences +17